Organ valve structure



Nov. 13, 1934. D, s, BAR OWS 1,980,964

ORGAN VALVE STRUCTURE Filed July 19, 1929 2 Sheets-Sheet l Nov. 13, 1934. S BARROWS 1,980,964

ORGAN VALVE STRUCTURE Filed July 19, l929 2 Sheets-Sheet 2 Patented Nov. 13, 1934 UNITED STATES PATENT OFFICE 27 Claims.

This invention relates to pipe organ valves and aims to provide a simple and inexpensive yet reliable valve structure, providing an arrangement in which the valves for the several pipes constitute units capable of individual mounting, replacement or adjustment, and accessible for all purposes, without mutual interference or any necessity for taking apart the wind chest.

In addition to the general object just stated,

the invention has for further objects such other improvements and advantages in construction and operation as may be attained by the structures and devices hereinafter described and claimed.

In the drawings which illustrate a structural embodiment of the invention in a preferred form:

Figure 1 is a vertical section through an organ wind chest showing one of the improved valves in position.

Figure 2 is a bottom plan view showing the base mounting for the valve applied to the bottom board of the wind chest.

Figure 3 is a horizontal section taken on the line 33 of Figure 1. I

Figure 4 is a top plan View of the cover plate of the mounting, taken on the line 44 of Figure 1.

Figure 5 is a top plan view of the intermediate 80 plate of the mounting.

Figure 6 is a vertical section taken on the line 66 of Figure 2.

The illustrative valve is of the electro-pneu- Ina-tic type and controls one of the individual pipes 35 11 of a series made up of pipes chromatically differentiated in pitch over a range comprising several octaves. Each individual pipe is planted in the top board 12 of the wind chest 13. Every series of pipes constitutes a stop all the pipes of 401 which are under the group control of the stop knob or tablet located at the console. When any stop is drawn or on, the pressure air is admitted to the wind chest division containing the pipe series constituting that particular stop. The depressing of any manual key will then cause the sounding of such of the correspondingly pitched pipes as belong to stops drawn on or coupled to that manual. 4

Ordinarily, each organ wind chest consists of several wind chest divisions, one for each stop.

As each stop comprises a series of pipes difierentiated chromatically in pitch and extending through a range of several octaves, a large number of valves controlled by the manual keys must F be provided for the playing of the pipes of the valves are structurally interrelated with each 09 other and with the wind chest, so as to make it necessary to disassemble the wind chest every time any single valve requires replacement, repair or adjustment. The problem of assembly, repair and maintenance of the valves has been solved in large measure by the improved valve structure, which provides an independent unit arrangement of each valve, so that the several valves of each wind chest, or division thereof, may be mounted, replaced or adjusted wholly independently of each other, and without any necessity for removal of any part of the wind chest.

The drawings show the application to an organ wind chest of an illustrative embodiment of the improved valve. For the sake of clearness, the duplication of parts before mentioned has been omitted from the illustration. The wind chest 13 consists essentially of a rectangular box-like structure, including the top board 12 and bottom board 14, and divided into as many chest divisions as there are stops whose pipes are planted on the top board 12; The interior of each chest division provides a pressure chamber 18 supplied, whenever the corresponding stop knob has been drawn at the console, with air under pressure used in the operation of the valves under the control of the manual keys and for sounding the pipes corresponding in pitchto the keys played.

The foot 15 of a pipe 11 is planted in a socket 16 provided in the top board 12. This socket 16 communicates by a port 17 with the pressure chamber 18. The discharge of pressure air from chamber 18 through port 17 to the pipe 11 is controlled by the illustrative valve structure, which may be considered as the secondary valve structure, the primary valve being operated electro-magnetically.

The valve body proper, which operates to open or close the port 17 leading to the pipe, consists of a disk 19, preferably of laminated construction. This disk 19 is adjustably secured by top and bottom thumb nuts 22, on the screw threaded upper portion 20 of the valve stem 21. The valve stem 21 passes through a bearing 23 seated in the top of the valve tube 24, and the stem 21 and tube 24 extend vertically through the chamber 18 to the bottom board 14. The bottom board 14 is provided with an opening 25, relatively larger in diameter than the tube 24 IOU and valve disk 19, for receiving the tube 24 and its enclosed valve stem 21. The bottom board opening also receives the hub 26 projecting upwardly from the base mounting, as hereinafter described and surrounding and supporting the valve tube 24.

The base mounting which supports the parts of the valve is secured on the outside of the wind chest. It is constructed so as not only to permit the entire valve structure to be removed as an independent unit from the wind chest, but also to afford ready access to such parts of the valve as require adjustment, thereby providing for individual attachment or removal of each valve and independent maintenance thereof,- without disturbance of the other valves and the wind chest. In the illustrative embodiment, the base mounting provides a carrier for the pneumatic operating elements of the valve and the electromagnet. The carrier is constituted of separable plates perforated with registrable openings and passages, which, when the plates are assembled in juxtaposed relationship, provide an exposed valve chamber and part of a passage for the flow of the pressure air, controlling the valve operation. A cover plate is detachably secured to the carrier and constitutes a closure for the valve chamber, and-provides the other part of the pressure flow passage. H

The carrier portion of the base mounting comprises the top plate 27 and the intermediate plate 37. The top plate 2'? is positioned adjacent to the exterior surface of the bottom board 14 andmay be secured thereto by screws 64 located preferably at the four corners of the plate. The hub 26 projects vertically upwardly from the top surface of plate 27 and is provided with a central bore 23 within which the valve tube 24 is rigidly, mounted. This hub may be formed as an integral part of the top plate 27 and, when the latter is in position beneath the bottom board, extends into the opening 25. The lower end of the bore 28 communicates with the apex of upper part 29 of the valve chamber 38, preferably conical in shape, and extending to and perforating the bottom surface of the plate 2"].

Adjacent to the opening 25, the bottom board 14 is provided with a clearance opening and port 30 for the electro-magnet 31 which forms part of the valve assembly. The carrier plate 27 extends beyond the clearance opening 30 in the bottom board and is provided with a clearance opening and port 32 which registers with the bottom board opening 30 and receives the base'33 of the electromagnet.

The lower end 34 of the valve stem 21 is screw threaded and passes through the top part 29 of the valve chamber 38 and projects a substantial distance into the bottom part of the chamber. In the intermediate portion of the chamber, the screw threaded end of the valve stem is adjustably connected to the pneumatic element, which includes the diaphragm or puif 35 and the adjusting washer or disk 36 positioned below and glued to the diaphragm. The diaphragm 35 may be made of a suitable membrane, such as a piece of thin leather of the proper size, and the washer 36 of a relatively thicker piece of leather or other light weight material.

The intermediate plate 37 may be secured removably to the bottom surface of the top plate 2'7, for example, by tubular grommets 39 let into the four corner holes 40, and receiving the screws ;64. This intermediate plate 37 is perforated by a circular opening 41 registrable with the top part 29 of the pressure chamber. The surrounding wall 43 of the opening may be curved and inclined convergently, as shown, to provide a cup-shaped lower part 41 of the valve chamber, which is open from the bottom surface of the intermediate plate. The intermediate plate extends beneath the clearance opening 32 perforated in the top plate 27 and provides in conjunction with said opening 32 a socket which receives the base 33 of the electro-magnet. A pair of air ducts 44 perforated through the plate 3'! connect the clearance opening 32 in the top plate with the armature chamber hereinafter described.

When the top and intermediate plates 27 and 37 are assembled in juxtaposed relationship, the surrounding edge of the diaphragm 35 is clamped between the plates so that the diaphragm extends across the intermediate portion of the valve chamber 38. In arranging the diaphragm between the plates, the central free portion of the diaphragm must be left sufiiciently loose to furnish the play required to impart the vertical operating move: ment of the valve stem.

The bottom cover plate 45 is detachably secured to the bottom surface of the intermediate plate 37 independently of the mutual attachment between the plates 27 and 37 forming the carrier, and of their attachment to the bottom board of the wind chest. For this purpose, separate screws 46 may be applied to registering screw holes in the intermediate and bottom plates. The cover plate 45 constitutes aclosure for the bottom part of the valve chamber and may be formed with a circular recess extension 48 adapted to register with the valve chamber and having a curved downwardly convergent surrounding wall 49. This extension 48 merges at its lower end into a well or pocket 50 located in the downwardly projecting knob portion 51 of the cover plate. The bottom of the well 50 provides a seat for the lower end of a coil spring 52. At its upper end, this spring 52 engages the washer 36 to keep the diaphragm 35 and valve stem 21 elevated, so long as air pressure is maintained simultaneously in both the upper and lower parts of the valve chamber 38 and above and below the diaphragm 35.

The cover or closure plate 45 extends beneath the pair of air ducts 44 and is provided with an armature chamber 53 with which the ducts 44 communicate. Within the chamber 53 is a suitable armature 54 forming the primary valve and controlling alternatively the supply and exhaust of air pressure to and from the lower part of the valve chamber below the diaphragm. The bottom of the armature chamber 53 communicates with an exhaust port 55 leading through the cover plate to the atmosphere. A duct 56, provided in the top of the cover plate, connects the armature chamber 53 with the lower part of the valve chamber.

Air pressure may be supplied to the upper part 29 of the valve chamber above the diaphragm by a suitable number of inlet ports 57 in the valve tube 24. These ports connect the interior of the tube with the pressure chamber constituting the wind chest division and permit air under pressure to enter the tube and flow from its open lower end intothe upper part 29 of the valve chamber. Air under pressure is maintained constantly above the diaphragm 35, so long as the stop knob, controlling the wind chest division containing the valve, is drawn, and provides reserve power for the operation of the valve.

The electric current for energizing the electromagnet 31 is controlled by a manual key which operates, the pipe 11 of corresponding pitch. So long as the key is not depressed, the magnet remains de-energized, and the armature 54 rests at the bottom of the armature chamber 53 to cover the exhaust port 55 and to uncover the pair of ducts 44. When so positioned, thearmature permits the pressure air from the wind chest division to pass through the pressure flow passage controlled by the electro-magnet into the lower part of the valve chamber below the diaphragm 35. This pressure flow passage includes the ports 30 and 32 respectively in the bottom board and top plate, the ducts 44 in the intermediate plate, the armature chamber 53, and the duct 56 leading from the armature chamber to the lower part of the valve chamber. Thus, the de-energizing of the electro-magnet produces a condition of air pressure balance above and below the diaphragm 35, and the spring 52 is permitted to force the disk 36 and diaphragm 35 upwardly, thereby to lift the valve stem 21 and valve body 19 to close the port 17 connecting the wind chest with the pipe 11.

The depressing of the manual key closes an electric circuit to energize the electro-rnagnet 31 and the energizing of the magnet attracts the armature 54 towards and closes the ducts 44 which connect the wind chest with the armature chamber. Concurrently with this movement of the armature, the exhaust port 55 is opened to the atmosphere, so that the pressure air exhausts from the lower part of the valve chamber below the diaphragm 35 through duct 56, armature chamber 53 and port 55 to the atmosphere. Thereupon the reserve air pressure maintained in the upper part 29 of the valve chamber 38 depresses the diaphragm 35 and stem 21 to lower the valve body 19 and uncover port 17. This permits the pressure air from the wind chest to enter the pipe 11 and cause it to speak. As soon as the manual key is released, the magnet 31 is de-energized and the armature 54 is permitted to fall to its position in which exhaust port 55 is closed and ducts 44 are opened to the armature chamber 53. Thus the air pressure supply to the lower part of the valve chamber is re-established through duct 56, whereupon the spring acts on the disk 36 and diaphragm to lift the stem 21 and close the valve.

In the application of the invention to practical use, it is desirable that the top plate 27, the intermediate plate 3'7 and the cover plate 45 be each made of a light, inexpensive, yet durable material that permits manufacture in quantity production of plates perforated to provide the necessary chambers, pressure flow passages and other openings. A satisfactory material for the plates is the phenolic condensation product known under the trade name of Bakelite". When made of bakelite, the plates constituting the mounting for the valve may be molded in the necessary perforated condition in large quantities. Plates molded of bakelite are adapted especially for organ valve mountings, as that material is insensitive to deformation under changes in atmospheric conditions.

Moreover, as before stated, the plates 27 and 37 function as clamping elements for the diaphragm 35. As the diaphragm usually consists of a leather membrane and thus contains substances, such as tannic acid, which react in contact with metal, the use of metallic clamps for the diaphragm brings about a reaction which impairs the quality of and ultimately destroys the diaphragm. Clamping elements, such as the plates 27 and 37, molded of the phenolic condensation product, provide engaging parts for holding the diaphragm which are non-reactive chemically with the diaphragm substance and hence avoid the occurrence of reactions such as impair the quality of and shorten the life of the diaphragm.

When applying the plates 27, 37 and 45 constituting the valve mounting to an organ wind chest, it is preferable to employ packing or gaskets between the mounting and the bottom board 14 and between individual plates of the mount ing, in order to prevent leakages through the joints. Paper gaskets are suitable for this purpose, and, as shown in Figure 1, paper gaskets 60, 61 and 62, properly perforated and of the proper shape, are interposed respectively in the joint between the mounting and the bottom board 14 and in the joints between the individual plates.

The improved valve mounting, comprising in the illustrative embodiment the top plate 27, the intermediate plate 37 and the cover plate 45, supports from the outside of the wind chest the entire valve organization, including the valve body 19, the valve stem 21, the tube 24 and the electro-magnet 31. Consequently, all of the parts of the valve may be removed as a unit from the wind chest by taking off the mounting, and application or removal of the valve may be quickly accomplished without disturbance of any other of the valves and without removal of any part of the wind chest.

The entire pressure flow system controlling the operation. of the valve pneumatic element is contained within the mounting, and the valve tube 24 supported thereby. This system includes the valve chamber, comprising the parts 29 and 41 located above and below the diaphragm and the lower extension 48 and spring well 50. It includes the pressure flow passage leading to the upper part 29 of the valve chamber 38, which passage comprises the valve tube 24 opening into the valve chamber above the diaphragm and the ports 57 connecting the valve tube with the interior of the wind chest. And the system also includes the pressure supply and exhaust passage for the lower part of the valve chamber, con trolled by the electro-magnet, which passage comprises the port 32 in registry with the port 30 in the bottom board, the ducts 44 in the intermediate plate 37, the armature chamber 53, the exhaust port 55, and the duct 56 connecting the armature chamber with the lower part of the valve chamber.

In the illustrative mounting, the top plate 2'7 and intermediate plate 37 conjointly provide upper and lower parts 29 and 41. of the valve chamber and also the clearance hole 32 and the ducts 44 which are included in the pressure circulatory passage controlled by the electro-magnet 31. The cover plate 45 provides the closure for the lower part of the valve chamber and the spring well 50 in registry therewith and also the remainder of the pressure circulatory passage, which includes the armature chamber 53, the exhaust port 55 and the duct 56. The valve diaphragm 35 is clamped across the valve chamber between the top plate 27 and the intermediate plate 37, and the adjustable element of the valve pneumatics, which comprises the disk 36 screw threaded on the lower end 34 of the valve stem, is located in the lower part 41 of the valve chamber. When the cover plate 45 is removed, the part 41 of the valve chamber below the diaphragm, containing the adjustable parts of the valve, is exposed. Hence, after unscrewing and removing the cover plate 45, the valve may be adjusted quickly by simply turning the lower portion 34 of the stem relatively to the disk 36. The adjustment is efiected Without removal of the valve from the wind chest and wholly from the exterior of the chest; so that there is no occasion for demoimting any part of the chest or disturbance of any other of the valves. The removal of the cover plate 45 also exposes the ducts 44, the armature chamber 53, the armature 54,

the duct 56, and the spring well 50, so that all of these elements are accessible for cleaning or -other purposes.

By removing the intermediate plate 37 from the top plate 27, the diaphragm 35 is released, and the top part 29 of the valve chamber, the clearance opening 32, the top of the pair of ducts 44 and the base of the electro-magnet are exposed. The intermediate plate 3'7 may be removed Whenever it is desired to remove the diaphragm or to gain access to the inner parts of the valve chamber and circulatory system or to reach the base of the electro-magnet. Removal of the intermediate plate 37 is not necessary, however, for performing the ordinary maint nance operations such asadjusting the valve, or cleaning the armature.

What is claimed is:

1. In combination ,With a pipe organ Wind chest, a mounting for electro-pneumatic pipe valves, involving, a plurality of separable plates perforated to provide registrable openings and having passageways, which constitute, on assembly of said plates in juxtaposed relationship, a pressure flow and valve chamber system, and means detachably securing said plates in such juxtaposed relationship to the exterior oi said Wind chest, and a leather diaphragm interposed between certain of said plates and adapted to close the valve chamber.

2. A mounting for electro-pneumatic pipe organ valves, involving separable plates perforated to provide registrable openings and having passageways, which constitute, on assembly or" said plates in juxtaposed relationship, a pressure how and valve chamber system adapted to receive the pneumatic and electro-magnet parts of a valve, said system including an open ended valve chamber and open pressure flow ducts, means for detachably securing said plates in such juxtaposed relationship, a cover plate constituting a closure for said valve chamber and provided with an armature chamber registrable with said open pressure flow ducts and with duct and port elements for alternatively connecting said armature chamber with said valve chamber and an exhaust port, and independent means for detachably securing said cover plate in registering relationship with said other plates.

3. A mounting for electro-pneumatic pipe organ valves, involving, a carrier for the pneumatic and electro-magnet parts of a valve, said carrier being constituted of separable plates having registrable openings and passages and assembled in juxtaposed relationship to provide a pressure flow and chamber system for the valve, which includes an open ended valve chamber and open pressure flow ducts, and a cover plate detachably secured to said carrier, and constituting a closure for said valve chamber, said cover plate having an armature chamber registrable with said open pressure flow ducts and provided with duct and port elements for alternatively connecting said armature chamber with said valve chamber and an exhaust port.

4. A mounting. for electro-pneumatic pipe organ valves, involving, a carrier for the pneumatic and electro-magnet parts of a valve, said carrier being constituted of separable plates having registrable openings and passages and assembled in juxtaposed relationship to provide part of a pressure flow and chamber system for the valve, and a cover plate detachably secured to said carrier, and constituting a removable closiu'e therefor, said cover plate having chamber and flow passage elements providing another part of said system.

5. A mounting for electro-pneumatic pipe organ valves, involving a carrier for the pneumatic and electro-magnet parts of a valve, said carrier being perforated to provide part of a pressure flow and chamber system for the valve, and a cover plate detachably secured to said carrier and constituting a removable closure therefor, said cover plate having chamber and flow passage elements providing another part of said system.

6. A mounting for an electro-pneumatic pipe organ valve, involving, a carrier provided with a hub for supporting the valve, said carrier being constituted of separable juxtaposed plates providing clamping support for a pneumatic element of the valve and a support for an electro-magnet, and also providing part of a pressure flow and chamber system for the valve, and a cover plate detachably secured to said carrier and constituting a removable closure therefor, said cover plate having chamber and air passage elements providing another part of said system.

'7. A mounting for an electro-pneumatic pipe organ valve, involving, a carrier provided With a hub for supporting the valve and with socket, duct and chamber elements providing support for the pneumatic and electro-magnet valve elements and also providing part of a pressure flow and chamber system for the valve, and a cover plate detachably secured to said carrier and constituting a removable closure therefor, said cover plate having chamber and air passage elements providing another part of said system.

8. A mounting for electro-pneumatic pipe organ valves, involving, a plurality of separable plates perforated to provide openings and passages respectively providing parts of a pressure fiow system and conjointly constituting, when the plates are assembled in juxtaposed relationship, a pressure flow system for said valve.

9. A mounting for electro-pneumatic pipe organ valves, involving, a plurality of separable plates perforated to provide openings and passages respectively providing parts of a pressure circulatory system and conjointly constituting, when the plates are assembled in juxtaposed relationship, a pressure circulatory system for said valve, and means for securing said plates in such juxtaposed relationship, including securing means for some of the plates independent of the securing means for others.

10. The combination with a pipe organ Wind chest, a valve therein, including, a valve stem extending through the chest to the exterior, a tube surrounding the stem, apneumatic element adjustably engaging the exterior portion of the valve stem, and a valve controlling electro-magnet also extending to the outside of the chest, of a base mounting for said valve positioned on the outside of the chest, said mounting involving, separable plates providing a hub support for the valve tube and a support for the electromagnet, and conjointly providing a valve chamber enclosing the pneumatic element and a pressure flow passage controlled by the electro-magnet, whereby removal of one of said plates exposes said pneumatic element and said pressure flow passage.

11. The combination with a pipe organ wind chest, a valve therein, including, a valve stem extending through the chest to the exterior, a tube surrounding the stem, a pneumatic element adjustably engaging the exterior portion of the valve stem, and a valve controlling electro-magnet also extending to the outside of the chest, of a base mounting for said valve positioned on the outside of the chest, said mounting involving separable plates, providing a hub support for the valve tube and a support for the electro-magnet and conjointly providing a valve chamber enclosing the pneumatic element, whereby removal of one of said plates exposes the pneumatic element.

l2. lhe combination with a pipe organ wind chest, a valve therein, an electro-magnet, and a pneumatic valve operating element located on the outside of the chest, of a base mounting for said valve positioned on the outside of the chest, said mounting involving separable plates conjointly providing clamping support and an enclosing chamber for said pneumatic element and providing also a pressure flow passage controlled by said electro-magnet.

13. The combination with a pipe organ wind chest, a valve therein, and a pneumatic valve operating element located on the outside of the chest, of a base mounting for said valve positioned on the outside of the chest, said mounting involving separable plates conjointly providing clamping support and an enclosing chamber for said pneumatic element.

14. The combination with a pipe organ wind chest, a valve therein, including a valve stem extending through the chest to the exterior, a valve tube surrounding the stem, and a pneumatic element adjustably engagin; the exterior portion of the valve stem, of a base mounting for said valve attached to the outside of said chest, involving, separable plates providing a hub support for the valve tube and conjointly providing a valve chamber enclosing the pneumatic element, whereby separate removal of one of said plates exposes said pneumatic element.

15. The combination with a pipe organ wind chest, valve therein including a valve stem extending through the chest to the exterior, and a pneumatic valve operating element connected to the exterior portion of the valve stem, of the improvement characterized by an exterior mounting for said pneumatic element, involving, separable plates conjointly providing clampfing support and an enclosing chamber for said "pneumatic element.

16. An electro-pneumatic valve structure for pipe organs, involving, a valve body working within a pipe organ wind chest, a valve stem connected to said body and extending to the outside of the wind chest, a pneumatic element adjustably secured to the exterior portion of said stem, an electro-magnet controlling the operation of said pneumatic element, and a mounting for the valve structure detachably secured to the outside of the wind chest, said mounting comprising a plurality of separable juxtaposed plates supporting the valve structure and conjointly providing the passages for the pressure air which operates the valve.

17. A mounting for electro-pneumatic pipe organ valves, involving, separable plates respectively provided with exposed registrable openings and passageways constituting, on assembly of said plates in juxtaposed relationship, a pressure flow and chamber system adapted to receive the pneumatic and electro-magnet parts of a valve, said system including an open ended valve chamber and open pressure flow ducts, means for detachably securing said plates in such juxtaposed relationship, a cover plate constituting a closure for said valve chamber and provided with an armature chamber registrable with said open pressure ducts, and independent means for detachably securing said cover plate in registering relationship with said other plates.

18. A mounting for electro-pneumatic pipe organ valves, involving, separable plates respectively provided with exposed registrable openings and passageways constituting, on assembly of said plates in juxtaposed relationship, a pressure flow and valve chamber system for a valve, means for detachably securing said plates in such juxtaposed relationship, a cover plate constituting a closure for said valve chamber and provided with an armature chamber registrable with a pressure duct of said s cm, and independent means for detachably securing said cover plate in registering relationship with said other plates.

19. A mounting for electro-pneumatic pipe organ valves, involving, separable plates respectively provided With exposed registrable openings and passageways constituting, on assembly of said plates in juxtaposed relationship, a pressure flow and valve chamber system for a valve, means for detachably securing said plates in such juxtaposed relationship, a cover plate constituting a closure for said valve chamber, and independent means for detachably securing said cover plate to one of said other plates.

.20. A mounting for electro--pneumatic pipe organ valves, involving, a plurality of separable plates respectively provided with exposed registrable openings and passageways constituting, on assembly of said plates in juxtaposed relationship, a pressure duct and valve chamber system for a valve, and attaching means arranged to permit optional demounting of one or more of said plates, for detachably securing said plates in said juxtaposed relationship.

21. A mounting for electro-pneumatic pipe organ valves, involving, plates seowrable as a unit to the exterior of a wind chest and respectively perforated with openings which conjointly provide an open ended valve chamber for containing the valve pneumatic element, and plates being provided also with a socket to receive an electromagnet and with air ducts communicating with said socket, said plates being mutually detachable to afford access to said openings, ducts and socket, and a cover plate providing a closure for the open end of said valve chamber and having a spring pocket for registry with said valve chamber and an armature chamber for registry with said air ducts, said cover plate being detachably secured to one of said plates independently of their mutual attachment, whereby removal of the cover plate affords access to said valve pneumatic element and said armature chamber without demounting said other plates.

22. A mounting for electro-pneumatic pipe organ valves, involving, juxtaposed plates provided with an open ended valve chamber for containing the valve pneumatic element and provided also with a socket to receive an electro-magnet and with air ducts communicating with said socket, said plates being mutually detachableto afiord access to all parts of said chamber, ducts and socket, and a cover plate providing a closure for the open end of said. valve chamber and having a spring pocket for registry with said valve chamber and an armature chamber for registry with said air ducts, said cover plate being detachably secured to one of said plates independently of their .mutual attachment, whereby removal of the cover plate affords access to said valve pneumatic element and said armature chamber without demounting said other plates.

23. A mounting for electro-pneumatic pipe organ valves, involving, juxtaposed plates provided with an open ended valve chamber for containing the valve pneumatic element including a diaphragm adjustably engaging the valve stem and provided also with a socket to receive an electromagnet and with air ducts communicating with said socket, said plates constituting clamping elements for clamping said diaphragm transversely of said valve chamber and being mutually detachable to aiTord access to all parts of said chamber, ducts and socket, and a cover plate providing a closure for the open end of said valve chamber and having a spring pocket for registry with said valve chamber and an armature chamber for registry with said air ducts, said cover plate being detachably secured to one of said plates independ- 3 ljjently of their mutual attachment, whereby removal of the cover plate affords access to said valve pneumatic element and said armature chamber without demounting said other plates.

24. A mounting for electro-pneumatic pipe organ valves, involving, juxtaposed plates perforated to provide openings which constitute an open ended valve chamber for containing the valve pneumatic element including a diaphragm adjustably engaging the valve stem and havin f also a socket to receive an electro-magnet and air ducts communicating with said socket, said plates constituting clamping elements for clamping said diaphragm transversely of said valve chamber and being mutually detachable to afiord I access to all parts of said chamber, ducts and socket, and a cover plate constituting a closure for the open end of said valve chamber and provided with an armature chamber for registry with said air ducts, said cover plate being detach- 0:; ably secured to one of said plates independently of their mutual attachment, whereby removal of the cover plate affords access to said valve pneumatic element and said armature chamber without demounting said other plates.

25. A mounting for electro-pneumatic pipe organ valves, involving, juxtaposed plates provided with an open ended valve chamber for containing the valve pneumatic element and provided also with a socket to receive an electro-magnet, and with air ducts communicating with said socket, said plates being mutually detachable to afford access to all parts of said chamber, ducts and socket, and a cover plate constituting a closure for said valve chamber and provided with an armaturechamber for registry with said air ducts, said cover plate being detachably secured to one of said plates independently of their mutual attachment, whereby removal of the cover plate affords access to said valve pneumatic element and said armature chamber without demounting said other plates.

26. A mounting for electro-pneumatic pipe organ valves, involving, juxtaposed plates provided with openings constituting an open ended valve chamber for containing the valve pneumatic element including a diaphragm adjustably engaging the valve stem, said plates constituting clamping elements for clamping said diaphragm transversely of said valve chamber and being mutually detachable to afiord access to said chamber above and below the diaphragm, and a cover plate providing a closure for the open end of said valve chamber and having a spring pocket for registry with said valve chamber, said cover plate being detachably secured to one of saidplates independently of their mutual attachment, whereby removal of the cover plate affords access to said valve pneumatic element without demounting said other plates,

27. A mounting for electro-pneumatic pipe organ valves, involving, juxtaposed plates provided with openings constituting an open ended Valve chamber for containing the valve pneumatic element including a diaphragm adjustably engaging the valve stem, said plates constituting clamping elements for clamping said diaphragm transversely of said valve chamber and being mutually detachable to afford access to said chamber above and below the diaphragm, and a cover plate con- 129 stituting a closure for said valve chamber, said cover plate being detachablysecured to one of said plates independently of their mutual attachment, whereby removal of the cover plate aiTords access to said'valve pneumatic element without demounting said other plates.

DONALD S. BARROWS. 

